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Finding the Fourth Proportional to 19,991.91, 29,981.04 and 14,428.73

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Solution

The fourth proportional to 19,991.91, 29,981.04 and 14,428.73 is: 21,638.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,991.91 : 29,981.04 = 14,428.73 : x
  2. Step 2: Convert to fraction form
    19,991.91/29,981.04 = 14,428.73/x
  3. Step 3: Cross multiply
    19,991.91x = 29,981.04 × 14,428.73
  4. Step 4: Simplify right side
    19,991.91x = 432,588,352.12
  5. Step 5: Solve for x
    x = 432,588,352.12/19,991.91
  6. Step 6: Final answer
    x = 21,638.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.